
    In a social networking platform's friend recommendation system, write a function that analyzes a username string to find the first unique character that appears only once, helping to distinguish between similar usernames for accurate friend suggestions. The function should process the username string efficiently and return the first non-repeated character to improve user identification accuracy in the recommendation algorithm.
    

    
def first_non_repeating_character(str1):
    """
    In a social networking platform's friend recommendation system, write a function that analyzes a username string to find the first unique character that appears only once, helping to distinguish between similar usernames for accurate friend suggestions. The function should process the username string efficiently and return the first non-repeated character to improve user identification accuracy in the recommendation algorithm.
    

    """
def first_non_repeating_character(str1):
    """
    In a social networking platform's friend recommendation system, write a function that analyzes a username string to find the first unique character that appears only once, helping to distinguish between similar usernames for accurate friend suggestions. The function should process the username string efficiently and return the first non-repeated character to improve user identification accuracy in the recommendation algorithm.
    

    """
    char_order = []
    ctr = {}
    for c in str1:
        if c in ctr:
            ctr[c] += 1
        else:
            ctr[c] = 1
            char_order.append(c)
    for c in char_order:
        if ctr[c] == 1:
            return c
    return None