Ah, C and strings. 
When reading from stdin, we can use fgets(str, n, stdin) to read at most n - 1 characters into a char array pointed to by str. We can also create a utility function to replace the newline character \n with the null terminator \0.
The following is inspired from C Primer Plus by Stephen Prata, sixth edition, listing 11.10:
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#include <stdio.h>
// Read at most `n` characters (newline included) into `str`.
// If present, the newline is removed (replaced by the null terminator).
void s_gets(char* str, int n)
{
char* str_read = fgets(str, n, stdin);
if (!str_read)
return;
int i = 0;
while (str[i] != '\n' && str[i] != '\0')
i++;
if (str[i] == '\n')
str[i] = '\0';
}
int main()
{
char my_string[10];
s_gets(my_string, 10);
printf("my_string = %s\n", my_string);
}
If we run the above program with the input test 12345, we obtain a char array of 9 characters followed by the null terminator \0:
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my_string = test 1234
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