Coding Problems

Decode a string encoded with k[encoded_string] pattern

Implement the atoi function to convert string to integer

Check if a string ends with a given suffix

Check if a string starts with a given prefix

Repeat a string n times

Count the number of lines in a multi-line string

Remove leading and trailing whitespace from a string

Compare two strings lexicographically

Find the first non-repeating character in a string

Check if one string is a substring of another

Replace all occurrences of a character in a string

Count how many times a character appears in a string

Remove all spaces from a string

Convert a string to lowercase

Convert a string to uppercase

Count the number of words in a string

Determine if a string reads the same backward as forward

Reverse a given string

Count the number of vowels in a string

Get the character at a specific position in a string