title: check to see if a char array begins with certain characers
body: <p>The code I need to write has the user input a mRna strand which is stored in a char array. This mRNa strand must start with the characters 'a','u','g'. I can't figure out how to validate whether that is true. I thought about getting the sum of the integer values and testing that but I cannot do that because it matches the letters of another 3 letters that can be entered.</p>
  
  <p>also,  each three letters translates to an amino acid. I dont know how to take each three letters and translate it. </p>
  
  <p>An example for my second question
  The mRNA string is 
  auguuuauu</p>
  
  <p>aug codes for methionine.</p>
  
  <p>uuu codes for phenylalaine.</p>
  
  <p>auu codes for isoleucine.</p>
  
  <p>so the program would go down the line reading each group of 3 and translating it. the values would then be stored in a character array. The way I'm thinking of doing this is making a loop that would store 3 values at a time into a char array. I dont know how to take that char array analyze what that value is and change it to what it needs to be. Once its changed i would just strcat it to the end.</p>