Help with C please, the programs needs to user enter input not having already a given string!

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Write a program to find the largest palindrome in a string. A palindrome is a sequence that reads the same backward as forward, racecar, eve, kayak are some examples. For this assignment implement the following function int palindromelength(char *str, int i, int j) This function takes a string str and two points i and j and determines whether the string from i to j is a palindrome. If it is a palindrome, it returns the length of the palindrome and if it is not a palindrome, it returns -1. Consider the following string as an example ABCBAHELLOHOWRACECARAREYOUIAMAIDOINEVERODDOREVENNGGOOD It has many palindromes in it including ABCBA, RACECAR, ARA, IAMAI. Largest palindrome Ls NEVERODDOREVEN since it has the most characters in it. Sample execution is given below Enter a string ABCBACDCBAAB Largest palindrome is ABCBA