#!/usr/bin/env python3
# -*- coding: utf-8 -*-
"""
Created on Tue Feb 26 16:50:23 2019

@author: lsantoca
"""

## Fonction bogué
# def split(text):
#     words, word = [], ''
#     for char in text:
#         if char == ' ':
#             words.append(word)
#             word = ''
#         else:
#             word += char
#     words.append(word)
#     return words

def split(text):
    words, word = [], ''
    l = len(text)
    i = 0
    while i < l :
        if text[i] == ' ':
            while(text[i] == ' '):
                i += 1
            if word:
                words.append(word)
            word = ''
        else:
            word += text[i]
            i += 1
    words.append(word)
    return words


def first_letter(word):
    """Cette fonction demande
    une chaine non vide en paramètre"""
    
    if not word: # si word est vide
        raise ValueError
    else:
        return word[0]        
    
def first_letters(text):
    letters = []
    words = split(text)
    for word in words:
        letters.append(first_letter(word))
    return letters

print(first_letters(' Hello beautiful  world'))