Longest Common Prefix

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First found the smallest string, just to avoid the IndexOutOfBound Exception and then just iterated through every string to make sure all their characters matched.

Full Solution in Java:

 public class Solution {
    public String longestCommonPrefix(String[] strs) {
        
        if(strs.length==0){
            return "";
        }
        
        StringBuilder sb = new StringBuilder();
        
        int min = Integer.MAX_VALUE;
        
        for(int i=0;i< strs.length; i++){
            min = Math.min(strs[i].length(), min);
        }
        

        for(int j=0; j< min; j++){
            char c = strs[0].charAt(j);
            for(int i=1; i< strs.length; i++){
                if(strs[i].charAt(j)!=c){
                    return sb.toString();
                }
            }
            sb.append(c);
        }
        
        
        return sb.toString();
    }
}