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How do I append a single char to a string in C?
i.e
char* str = "blablabla"; char c = 'H'; str_append(str,c); /* blablablaH */ 
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Use the strncat() function to append the character ch at the end of str. strncat() is a predefined function used for string handling. string. h is the header file required for string functions.
The strcat() method is used to concatenate strings in C++. The strcat() function takes char array as input and then concatenates the input values passed to the function.
Concatenation is the process of appending one string to the end of another string. You concatenate strings by using the + operator. For string literals and string constants, concatenation occurs at compile time; no run-time concatenation occurs. For string variables, concatenation occurs only at run time.
In C, the strcat() function is used to concatenate two strings. It concatenates one string (the source) to the end of another string (the destination). The pointer of the source string is appended to the end of the destination string, thus concatenating both strings.
char* str = "blablabla"; You should not modify this string at all. It resides in implementation defined read only region. Modifying it causes Undefined Behavior.
You need a char array not a string literal.
Good Read:
What is the difference between char a[] = "string"; and char *p = "string";
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