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diff --git a/submission/Prakhar-Agrawal/Longest-Common-Prefix/Screenshot 2.png b/submission/Prakhar-Agrawal/Longest-Common-Prefix/Screenshot 2.png
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diff --git a/submission/Prakhar-Agrawal/Longest-Common-Prefix/solution.py b/submission/Prakhar-Agrawal/Longest-Common-Prefix/solution.py
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+++ b/submission/Prakhar-Agrawal/Longest-Common-Prefix/solution.py
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+class Solution:
+    def longestCommonPrefix(self, strs: List[str]) -> str:
+        if not strs:
+            return ""
+        
+        prefix = strs[0]  
+        
+        for s in strs[1:]:
+            while not s.startswith(prefix):
+                prefix = prefix[:-1] 
+                if not prefix:
+                    return ""
+        
+        return prefix
diff --git a/submissions/Prakhar-Agrawal/Add-String/Screenshot 1st.png b/submissions/Prakhar-Agrawal/Add-String/Screenshot 1st.png
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diff --git a/submissions/Prakhar-Agrawal/Add-String/solution.py b/submissions/Prakhar-Agrawal/Add-String/solution.py
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+++ b/submissions/Prakhar-Agrawal/Add-String/solution.py
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+class Solution:
+    def addStrings(self, num1: str, num2: str) -> str:
+        i, j = len(num1) - 1, len(num2) - 1  # Pointers to the last digit
+        carry = 0
+        result = []
+
+        while i >= 0 or j >= 0 or carry:
+            digit1 = int(num1[i]) if i >= 0 else 0
+            digit2 = int(num2[j]) if j >= 0 else 0
+
+            total = digit1 + digit2 + carry
+            carry = total // 10
+            result.append(str(total % 10))
+
+            i -= 1
+            j -= 1
+
+        return ''.join(result[::-1])
+