Crossed words

This is a fun Kata for crossword lovers!

    S    
    Y    
    N    
    T    
GRAPHICAL
    E    
    S    
    I    
    S    

Task

Write a function that takes two strings as input, and outputs the two words crossing.

Input

Two strings, str1 and str2.

• There is a maximum of 20 characters for each word.
• The words may be a different lengths.
• The words will be in capital letters and have no other characters.
• The words will always share at least one common letter, so you do not need to worry about invalid cases.

Output

• Your function should output the first word horizontally and the second word vertically.
• The words cross at the point of the first instance of a common letter in the second word.
• A space character is used to fill the blank spaces.
• Each line ends with the newline character.

Example

str1 = "GRAPHICAL"
str2 = "SYNTHESIS"

returns the sample at the top.