Write a C program which inputs a sentence from the user and then inputs a character from the user. Then it counts and prints the number of occurrences of the character in the sentence Without using string library.

Write a program that reads $3$ strings then concatenates them together in a one string Without using the string library $.$

Example:

char $str1[]=$abc;

char $str2[]=123$;

char $str3[]=$abcdef;

char $str4[80]$;

$str4$ must contains:$abc123$abcdef