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Write a function `remove_odd_characters` that takes a string as input and returns a new string containing only the characters at even indices (0-based index) of the input string.
#### Example Usage
```python [main.nopy]
remove_odd_characters("python") # Output: "pto"
remove_odd_characters("programming") # Output: "pormig"
```def remove_odd_characters(input_string):
"""
Removes characters at odd indices from the input string.
Parameters:
input_string (str): The string to process.
Returns:
str: A new string with characters at odd indices removed.
"""
# Placeholder for the solution
pass