Update README.md

README.md

@@ -7,7 +7,7 @@
 This project is the simulation of a complete digital communication system. A digital communication system consists of multiple blocks and each block is implemented here as a MATLAB function and 'main_code.m' file combines them all to build the complete system. The system reads text file 'source_data.txt' from the Data folder and process the text data accordingly and writes the received text into another text file named 'received.txt' again in the Data folder. 
 The block diagram below shows all the block of the system in a sequential manner. 
 
-## Block-Diagram 
+### Block-Diagram 
 <p align="center">
  <img src="https://user-images.githubusercontent.com/37298971/52767116-acbd0b80-3053-11e9-9998-4dd80c8a2825.png" width="650"
 </p>
@@ -33,4 +33,4 @@ The simulation is performed using the following properties.
  <img src="https://user-images.githubusercontent.com/37298971/52768106-aed49980-3056-11e9-9e31-5dbf125b494e.png" width="620"
 </p>
 
-From reading the ‘source_data.txt’ file to write the received data to a ‘received_data.txt’ file requires only 31.90s. 
+From reading the 'source_data.txt' file to write the received data to a 'received_data.txt' file requires only 31.90s.