diff --git a/practice-tdd/count.js b/practice-tdd/count.js
index 5518c5712..c9d37f147 100644
--- a/practice-tdd/count.js
+++ b/practice-tdd/count.js
@@ -1,3 +1,9 @@
 export function countChar(stringOfCharacters, findCharacter) {
-  return 5
+  let count = 0;
+  for (let character of stringOfCharacters) {
+    if (character === findCharacter) {
+      count++;
+    }
+  }
+  return count;
 }
diff --git a/practice-tdd/count.test.js b/practice-tdd/count.test.js
index cb3aaae59..99677c8c9 100644
--- a/practice-tdd/count.test.js
+++ b/practice-tdd/count.test.js
@@ -22,3 +22,17 @@ test("should count multiple occurrences of a character", () => {
 // And a character `char` that does not exist within `str`.
 // When the function is called with these inputs,
 // Then it should return 0, indicating that no occurrences of `char` were found.
+test("should return 0 when character doesn't occur", () => {
+  const str = "salam";
+  const char = "b";
+
+  const count = countChar(str, char);
+  expect(count).toEqual(0);
+});
+test("should return 0 when the string is empty", () => {
+  const str = "";
+  const char = "b";
+
+  const count = countChar(str, char);
+  expect(count).toEqual(0);
+});
\ No newline at end of file
diff --git a/practice-tdd/get-ordinal-number.js b/practice-tdd/get-ordinal-number.js
index 5c6291f5e..9b7e531f7 100644
--- a/practice-tdd/get-ordinal-number.js
+++ b/practice-tdd/get-ordinal-number.js
@@ -1,3 +1,10 @@
 export function getOrdinalNumber(num) {
-  return "1st";
+  if (num % 10 === 1 && num % 100 !== 11) {
+    return num + "st";
+  } else if (num % 10 === 2 && num % 100 !== 12) {
+    return num + "nd";
+  } else if (num % 10 === 3 && num % 100 !== 13) {
+    return num + "rd";
+  }
+  return num + "th";
 }
diff --git a/practice-tdd/get-ordinal-number.test.js b/practice-tdd/get-ordinal-number.test.js
index e23174a18..d52171fb2 100644
--- a/practice-tdd/get-ordinal-number.test.js
+++ b/practice-tdd/get-ordinal-number.test.js
@@ -18,3 +18,43 @@ test("should append 'st' for numbers ending with 1, except those ending with 11"
   expect(getOrdinalNumber(21)).toEqual("21st");
   expect(getOrdinalNumber(131)).toEqual("131st");
 });
+// Case 2: Numbers ending with 2 (but not 12)
+test("should append 'nd' for numbers ending with 2, except 12", () => {
+  expect(getOrdinalNumber(2)).toEqual("2nd");
+  expect(getOrdinalNumber(22)).toEqual("22nd");
+  expect(getOrdinalNumber(132)).toEqual("132nd");
+});
+// Case 3: Numbers ending with 3 (but not 13)
+test("should append 'rd' for numbers ending with 3, except 13", () => {
+  expect(getOrdinalNumber(3)).toEqual("3rd");
+  expect(getOrdinalNumber(23)).toEqual("23rd");
+  expect(getOrdinalNumber(133)).toEqual("133rd");
+});
+// Case 4: Numbers ending with "th" including the special case (11,12,13)
+test(`Numbers ending with "th" including the special case (11,12,13)`, () => {
+  expect(getOrdinalNumber(10)).toEqual("10th");
+  expect(getOrdinalNumber(11)).toEqual("11th");
+  expect(getOrdinalNumber(12)).toEqual("12th");
+  expect(getOrdinalNumber(13)).toEqual("13th");
+  expect(getOrdinalNumber(14)).toEqual("14th");
+  expect(getOrdinalNumber(5)).toEqual("5th");
+  expect(getOrdinalNumber(4)).toEqual("4th");
+});
+// Case 5: Numbers greater than 100 ending with "th"
+test(`Numbers greater than 100 ending with "th"`, () => {
+  expect(getOrdinalNumber(100)).toEqual("100th");
+  expect(getOrdinalNumber(104)).toEqual("104th");
+  expect(getOrdinalNumber(110)).toEqual("110th");
+  expect(getOrdinalNumber(255)).toEqual("255th");
+  expect(getOrdinalNumber(999)).toEqual("999th");
+  expect(getOrdinalNumber(1000)).toEqual("1000th");
+});
+// Case 6: Numbers greater than 100 with the special case (111, 112, 113)
+test(`Numbers greater than 100 ending in 11, 12, 13 use "th"`, () => {
+  expect(getOrdinalNumber(111)).toEqual("111th");
+  expect(getOrdinalNumber(112)).toEqual("112th");
+  expect(getOrdinalNumber(113)).toEqual("113th");
+  expect(getOrdinalNumber(211)).toEqual("211th");
+  expect(getOrdinalNumber(312)).toEqual("312th");
+  expect(getOrdinalNumber(1013)).toEqual("1013th");
+});
\ No newline at end of file
diff --git a/practice-tdd/repeat-str.js b/practice-tdd/repeat-str.js
index af273f3b0..b7b171789 100644
--- a/practice-tdd/repeat-str.js
+++ b/practice-tdd/repeat-str.js
@@ -1,5 +1,12 @@
-export function repeatStr() {
+export function repeatStr(str, count) {
   // Your implementation of this function must *not* call String.prototype.repeat (https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/String/repeat).
   // The goal is to re-implement that function, not to use it.
-  return "hellohellohello";
+  if (count < 0) {
+    return "negative counts are not valid";
+  }
+  let result = "";
+  for (let i = 0; i < count; i++) {
+    result = result + str;
+  }
+  return result;
 }
diff --git a/practice-tdd/repeat-str.test.js b/practice-tdd/repeat-str.test.js
index 8a7036102..1be049b24 100644
--- a/practice-tdd/repeat-str.test.js
+++ b/practice-tdd/repeat-str.test.js
@@ -15,18 +15,51 @@ test("should repeat the string count times", () => {
   const repeatedStr = repeatStr(str, count);
   expect(repeatedStr).toEqual("hellohellohello");
 });
-
+test("should return an empty string when repeating an empty string multiple times", () => {
+  const str = "";
+  const count = 3;
+  const repeatedStr = repeatStr(str, count);
+  expect(repeatedStr).toEqual("");
+});
 // Case: handle count of 1:
 // Given a target string `str` and a `count` equal to 1,
 // When the repeatStr function is called with these inputs,
 // Then it should return the original `str` without repetition.
-
+test("should return the original `str` without repetition", () => {
+  const str = "hello";
+  const count = 1;
+  const repeatedStr = repeatStr(str, count);
+  expect(repeatedStr).toEqual("hello");
+});
+test("should return an empty string when the string is empty and count is 1", () => {
+  const str = "";
+  const count = 1;
+  const repeatedStr = repeatStr(str, count);
+  expect(repeatedStr).toEqual("");
+});
 // Case: Handle count of 0:
 // Given a target string `str` and a `count` equal to 0,
 // When the repeatStr function is called with these inputs,
 // Then it should return an empty string.
-
+test("should return an empty string", () => {
+  const str = "hello";
+  const count = 0;
+  const repeatedStr = repeatStr(str, count);
+  expect(repeatedStr).toEqual("");
+});
+test("should return an empty string when the string is empty and count is 0", () => {
+  const str = "";
+  const count = 0;
+  const repeatedStr = repeatStr(str, count);
+  expect(repeatedStr).toEqual("");
+});
 // Case: Handle negative count:
 // Given a target string `str` and a negative integer `count`,
 // When the repeatStr function is called with these inputs,
 // Then it should throw an error, as negative counts are not valid.
+test("should return an error, as negative counts are not valid", () => {
+  const str = "hello";
+  const count = -1;
+  const repeatedStr = repeatStr(str, count);
+  expect(repeatedStr).toEqual("negative counts are not valid");
+});